Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Negative pressure values 2D laminar tube flow
Posted 13.02.2017, 09:38 GMT-5 Fluid & Heat, Structural Mechanics Version 5.0 0 Replies
Please login with a confirmed email address before reporting spam
I do model 2D laminar air flow within compliant (flexible) tube with a constriction by introducing gauge pressure (relative pressure) boundaries (inlet pressure = 400[Pa] and outlet pressure pressure = 0[Pa]). I do so because velocity boundary condition at the inlet would not reflect the physics appropriately (it would prescribe mass flow eintering the tube what is not the case). The simulation runs stable. I do observe altering pressure values (with zero crossing) in the middle of the channel. A pressure drop within the constriction is plausible but what do negative pressure values mean? What does COMSOL relate the pressure to? Is it always the zero pressure boundary or outlet?
Many Thanks in advance!
With kind regards
Alexander
Hello Alexander Werth
Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.
If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.